CODEWITHSUNDEEP
delphi
Aidan Quinn
Aidan Quinn

Reputation: 1188

Delphi, using numbers in edits

I was wondering if there is a component like the 'edit', but just for numbers so I can use the .value function in my code. My textbook says I must make a program, that when the user enters a number and clicks the execute button, the results of the functions must be determined. The functions are: Trunc, round, frac, sqr and sqrt. I have to enter the value into, what looks like an 'edit', but whenever I use the .value in my code, it gives me an error saying :Undeclared identifier: 'value'. Although it works when I use a 'SpinEdit'. Forgive me for being really thick, I do have a severe chest and sinus infection with a fairly bad fever, so my mind is somewhere else at the moment. Thanks! Oh, and by the way, I have also used the 'MaskEdit' component but it still gives me the same error

Upvotes: 1

Views: 977

Answers (2)

GabrielF
GabrielF

Reputation: 2121

Well, since you asked if there is an edit like component for that, I use TMS AdvEdit. It does a very decent job handling integers and floats. If you can afford it, it's really useful.

It has .FloatValue and .IntValue properties for reading and writing the value, and an EditType that specifies what kind of input is accepted.

Upvotes: 0

David Heffernan
David Heffernan

Reputation: 612993

For an edit control there is no property named Value, which is what the compiler is telling your. For an edit control the property you need is Text. That's a string containing the contents of the edit control. You'll need to use StrToFloat or TryStrToFloat to convert to a real type.

You can use a masked edit if you like, and validate the input on entry. The TMaskEdit control derives from TCustomEdit, and again the property used for accessing its content is Text and of type string.

Personally I don't like that because I don't think it gives the clearest feedback to users. It's also hard to write a mask for a general floating point value. Myself, I would validate at the point where the program needs to convert from string to real.

Upvotes: 1

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